CRCGDI IVD Intake Valve & Turbo Cleaner

Seems to work well, great value, just as described

Tried this in a 1.6 Hyundai Gamma II GDI engine that they put in the Kia Soul's. (Yes, Hyundai makes a lot of Kia's parts, including that engine). The proper way to clean intake valves on a GDI (direct injection) engine is to REMOVE the intake manifold and walnut-blast the back side of the intake valves. BIG JOB, and not always necessary. I inspected the intake valves with a borescope BEFORE and AFTER I used this product. It cleaned the intake valves very well! I've long used CRC products, and this will be another one I recommend every oil change, because, why NOT! Keep those valves as clean as you can, it will improve gas mileage and prolong the life of your engine. It will prevent carbon build up. NOTE: If your intake valves are too dirty, you will need to remove the intake manifold and clean the proper way. But this product works well, especially if you have a new car and begin using it right away at least every 10,000 miles, or every 2-3 oil changes. On the Kia Soul, I removed the brake booster vacuum line and sprayed the CRC direct injection intake valve cleaner into the system that way. SECOND NOTE: DO NOT SPRAY CRC INTAKE VALVE CLEANER IN THE AIR CLEANER/FILTER BOX, IT WILL DESTROY YOUR MAF (MASS AIR FLOW) SENSOR.

Used CRC GDI IVD Intake Valve & Turbo Cleaner on my 2011 Sonata with the 2.4 GDI engine—super straightforward process. Disconnected the intake, followed the directions, let it soak, and took it for a good Italian tune-up afterward. Whole thing took maybe 15 minutes plus a fun drive.Now, I don’t have a borescope to check before-and-after carbon levels, but I swear the car felt more responsive afterward. Idle smoothed out, throttle felt a bit sharper, and low-end torque seemed to wake up a little. Could be the placebo effect, sure—but if it is, it’s the best placebo I’ve tried in a while.For a DIY option without pulling the manifold, this stuff’s hard to beat. I’m pairing it with BG 44K next tank for a one-two punch. We’ll see how it holds up over time, but so far? Worth it. If your GDI engine’s acting a little sluggish, hit it with this and see if it doesn’t start acting right again.Would absolutely recommend—especially for higher-mileage GDI engines that’ve never had the valves cleaned.

I did two successive treatments at about 1,000 miles apart, then I changed the oil. Just before I changed the oil, I sent an oil sample to Blackstone Labs for analysis. No engine damage was detected in the analysis (see report in photo).I'm docking one star off this product because it's a bit scary to use. The first time I used it: the engine knocked, pinged, misfired, and the check engine light came on during the test drive. The light turned itself off after a few restarts and 50 miles of driving. The second time I used the product, when the engine knocked, pinged, and misfired, I pulled over to the side of the road, put the car in park (or neutral), and revved the engine a few times (not exceeding 3,500 rpm per instruction). This cleared out the excess (lots of smoke came out the tailpipe) and I did not get a check engine light.To keep the engine at 2,000 rpm while spraying, I built a rig using Reach 'n Spray and some bicycle brake parts (see photo). That way I can spray and sit in the driver's seat. Originally, I used a fuel line to extend the straw to the vacuum port (see photo), but the Technical Support Staff at CRC advised me to spray directly else the solution may not atomize properly which may lead to engine or catalytic converter damage.Here's the instruction:1. Warm up the engine2. Spray in 1-second bursts and 1-second rests while keeping RPM at 2,000 until can is empty3. Rev engine 3 times not exceeding 3,500 RPM, then idle for 1 minute4. Shut engine off and wait 1 hour5. Start engine, rev engine a few times not exceeding 3,500 RPM to clear out excess, and drive at highway speed for at least 10 minutes. (If the engine runs rough, pull to the side of the road, put the transmission in park or neutral, and rev engine a few times (do not exceed 3,500 rpm per instruction) until no more smoke comes out of tailpipe, then continue driving at highway speed.) If your engine continues to run rough, repeat the above procedure to clear out the excess solution. Do not put a heavy load on your engine or drive at highway speed until the knocks, pings, and misfires are gone (you may damage your engine).I sprayed through a vacuum port closest to the throttle body. By spraying through that vacuum port, I keep the spray atomized and avoid accidentally spraying the MAF sensor. Do not spray the MAF sensor as this could trigger a check engine light or damage the MAF.Here's my understanding: CRC GDI IVD Cleaner uses polyether amine (PEA) as detergent. This detergent needs a heat soak to help emulsify with the carbon. Then when heated the emulsion vaporizes and goes into the cylinder and out the exhaust. The cleaning process is slow: if you have 100,000 miles on your engine the average amount of carbon removed from your valve is about 10-20%.I plan to do this cleaning procedure before every oil change.NOTE Lexus IS250: For better distribution of cleaning solution to all cylinders, use the EVAP port or the PCV port on the air surge tank (upper intake manifold) to shoot in your cleaner (see Photo with ports labeled). The Toyota ACIS (Acoustic Control Induction System) divides the air intake into upper and lower paths. You want to shoot the cleaning solution before the divide. Only the EVAP and PCV ports are before the divide. All other ports connect to the upper path, so the lower path is not cleaned. When spraying into the EVAP port, temporarily use a 5/16 inch diameter hose to bridge from the EVAP VSV to the UNUSED vacuum port (see photo).WARNING: You can damage the engine if it hydrolocks. Be sure to maintain 2,000 RPM and spray in short bursts. For added safety, you can rev the engine 2-3 times every 30 to 45 seconds to prevent puddling of the cleaning solution in the intake tract. The EVAP (PURGE) or PCV ports are the recommended ports to use (other ports may not distribute the solution properly causing engine or catalytic converter damage).

I use this product every 10,000 miles. After applying it, the engine runs much smoother. I can only assume this is the direct result of clean valves.The CDC Valve and Turbo Cleaner is made from the same detergents found in gasoline. In a low pressure fuel injected car, gasoline goes over the valves. High quality gasoline includes detergents to keep the engine clean. Direct Injected cars / trucks put the fuel directly into the cylinder. This means the valves are not cleaned by the detergents in the gasoline. CDC Valve and Turbo Cleaner (V&TC) solves the problem.The first time I applied the product (V&TC), I saw gunk on the rear of my car. This presumably came from the valves. The next time I applied the product, I did not notice the gunk on my car. To me, this is an indication V&TC is working.The first two times, I disassembled the intake to spray V&TC into the intake. The third time, I found a vacuum line (brake booster) and applied the product to the vacuum line. Applying though the vacuum line is the easiest way to spray the product into the upper engine. However, this means only the exhaust side of the turbo is cleaned.I have not removed the intake manifold and used a borescope to inspect the valves. That's a bit more than I want to do. I judge the product on the way my car runs. Based on this, CRC Valve and Turbo Cleaner does its job.